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US4028455A - Method for producing a reduced-pressure shaped mould - Google Patents

Method for producing a reduced-pressure shaped mould Download PDF

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Publication number
US4028455A
US4028455A US05/623,456 US62345675A US4028455A US 4028455 A US4028455 A US 4028455A US 62345675 A US62345675 A US 62345675A US 4028455 A US4028455 A US 4028455A
Authority
US
United States
Prior art keywords
flask
coating film
mould
caking agent
pattern
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/623,456
Other languages
English (en)
Inventor
Shoji Ueda
Shuzi Ono
Hiroshi Sakaguchi
Hideo Tsunoda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Application granted granted Critical
Publication of US4028455A publication Critical patent/US4028455A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3821—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process composed of particles enclosed in a bag
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum

Definitions

  • the present invention relates to a method for producing a reduced-pressure shaped mould.
  • FIG. 1 is a cross-section of components used in the known method at one stage of the method
  • FIG. 2 is a cross-section of components used in the known method at a further stage.
  • FIG. 3 is a cross-section of components in the final stage of manufacture in the known method.
  • a pattern 1, having the shape of castings to be moulded, is fixedly placed on a surface plate 3 having a vacuum chamber 3a and an evacuating pipe 4.
  • the pattern 1 is provided with a large number of gas-permeable orifices therein extending from its surface to the vacuum chamber 3a of the surface plate 3 through orifices 2 in the plate 3.
  • an air-tight sheet 5 made of a polyethylene vinyl acetate (EVA) copolymer film, after the sheet has been softened and brought into an easily expansible and contractible state by heating with any appropriate heating means 6.
  • EVA polyethylene vinyl acetate
  • the air-tight sheet 5 is sucked in and adhered to the surface of the pattern 1 by reducing the pressure within the vacuum chamber 3 through the evacuating pipe 4.
  • a flask 8 is subsequently fixedly placed on the sheet 5 as shown in FIG. 2.
  • a vacuum chamber 11 provided with an evacuating pipe 13 and having a large number of gas-permeable orifices 9 communicating with the interior of the flask 8.
  • the flask 8 After the flask 8 has been fixedly placed as described above, its interior is filled with solid particles 7, not containing a caking agent, such as sand, iron granules or the like.
  • An air-tight sheet 12 is then placed on the flask to cover the entire surface of the solid particles 7 including the upper edge surface of the flask 8 to seal the flask 8, and thereafter the interior of the vacuum chamber 11 is reduced in pressure through the evacuating pipe 13. During this operation the interstices between the solid particles 7 are reduced in pressure via the gas-permeable orifices 9, so that the air-tight sheets 5 and 12 are sucked onto the solid particles 7 in the flask 8.
  • reference numeral 10 designates a screen mounted on the inside wall surface of the flask 8, which screen 10 is provided for the purpose of preventing the solid particles 7 within the flask 8 from entering the vacuum chamber 11 via the gas-permeable orifices 9.
  • the object of the present invention is to obviate or at least mitigate the aforementioned disadvantages of the known method.
  • FIGS. 4 to 7 of the accompanying drawings in which:
  • FIG. 4 is a cross-section of components used in a method according to the invention at one stage in the method
  • FIG. 5 is a cross-section of components in the same method at a later stage
  • FIG. 6 is a cross-section of a partially completed mould according to the invention.
  • FIG. 7 is a cross-section of a mould made by the method of FIGS. 4 to 6.
  • FIGS. 4 to 7 and FIGS. 1 to 3 the same numerals have been used for the same component parts and the parts perform the same function in each case unless otherwise stated.
  • the sheet 5 used in the present method is a coating film that is soluble in a solvent.
  • a coating film that is soluble in a solvent a polyvinyl alcohol (PVA) film that is soluble in water, a water-soluble paper containing as a principal component carboxymethyl-cellulose, and a plastic film that is soluble in general organic solvents are known, and these films are available as said coating film.
  • PVA polyvinyl alcohol
  • the pattern 1 is placed on the surface plate 3 so that their gas-permeable orifices 2 may communicate with each other, and thereafter the coating film 5 that is soluble in a solvent and that has been placed on the surface of the pattern 1 after being heated (as described with reference to FIG. 1), is sucked onto the surface of the pattern 1 and the surface plate 3 by evacuation through the gas-permeable orifices 2 and the evacuating pipe 4.
  • a nylon film that is soluble in alcohol is used as a coating film.
  • solid particles 7 not containing a caking agent such as pebbles, nonferrous metal granules, iron granules or moulding sand, are placed in the interior of the flask 8 to fill it, and the upper surface of the solid particles and the flask is covered with an air-tight sheet 12 (vinyl sheet).
  • a caking agent such as pebbles, nonferrous metal granules, iron granules or moulding sand
  • the vacuum chamber 11 of the flask 8 is evacuated by means of an evacuating device (not shown) through the evacuating pipe 13 and simultaneously if the reduced pressure on the side of the surface plate 3 is released, then the air-tight sheet 12 is sucked onto the upper surface of the coagulated and hardened moulding sand 7 and the coating film 5 is sucked onto its lower surface.
  • a mould cavity portion 14 that is the same shape as the pattern 1 and is defined by the coating film 5, which is soluble in a solvent, as its surface, can be formed at the lower surface of the coagulated and hardened moulding sand 7.
  • a solution containing a caking agent dissolved in a solvent which can dissolve the coating film 5 on the surface of the cavity portion 14, is applied to this surface (FIG. 7).
  • a hardened layer 15 is formed, and thereby a desired mould can be obtained.
  • the principal component and the composition of the applied solution are as follows:
  • the principal solvent in this composition is alcohol, and the caking agent that is soluble in the solvent is vinyl acetate and ethylsilicate. It is to be noted that as a resin that is soluble in alcohol, phenol resin, nylon resin or the like has been known, and it is of course possible to apply these resins to the alcohol soluble coating film.
  • a water-soluble coating film is used as the coating film 5, then a solution containing a water-soluble caking agent could be applied to the surface of the coating film 5, while if a coating film that is soluble in another organic solvent is used, then a soluble containing a caking agent that is soluble in said organic solvent could be applied to the surface of the coating film 5.
  • the coating film 5 When a solution that can solve the coating film 5 has been applied to the surface of the coating film 5, the coating film 5 is dissolved in the solvent contained in the solution, and since the interstices in the moulding sand 7 are reduced in pressure, the caking agent contained in the dissolved coating film 5 and in the solution can permeate into the interstices of the moulding sand 7.
  • the solvent in the solution is evaporated and removed from the moulding sand 7 through the evacuating pipe 13, so that the coating film material as well as the caking agent permeated through the surface layer of the moulding sand 7 will be hardened, resulting in a hardened layer of sand having a large mechanical strength in the surface layer portion of the moulding sand 7.
  • the mechanical strength of these hardened layers is different depending upon the kind of the caking agent, and for instance, in the case of the above-referred ethylsilicate-vinylacetate system, the compression strength is as high as 40 to 60 kg/cm 2 .
  • the application of a solution containing a caking agent is carried out so that a hardened layer 15 of 2 mm to 10 mm in thickness may be formed in the surface layer portion of the cavity section.
  • FIG. 7 shows a cross-section of a mould which has been formed with a hardened layer 15 of about 2 to 10 mm in thickness having a large mechanical strength along the surface of the cavity section 14 through the above-described method.
  • the formed hardened layer is excellent not only in mechanical strength but also in refractoriness. Therefore, not only sand burning upon pouring can be prevented, but also defects of sand mixing caused by mould deformation during the pouring which have been found in the reduced-pressure shaping method in the prior art can be obviated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
US05/623,456 1974-11-22 1975-10-17 Method for producing a reduced-pressure shaped mould Expired - Lifetime US4028455A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JA49-134691 1974-11-22
JP49134691A JPS5160629A (en) 1974-11-22 1974-11-22 Genatsuzokeiigatano seisakuhoho

Publications (1)

Publication Number Publication Date
US4028455A true US4028455A (en) 1977-06-07

Family

ID=15134318

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/623,456 Expired - Lifetime US4028455A (en) 1974-11-22 1975-10-17 Method for producing a reduced-pressure shaped mould

Country Status (8)

Country Link
US (1) US4028455A (ja)
JP (1) JPS5160629A (ja)
AT (1) AT338448B (ja)
CH (1) CH592483A5 (ja)
FI (1) FI58730C (ja)
FR (1) FR2291810A1 (ja)
GB (1) GB1522499A (ja)
SE (1) SE419605B (ja)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129164A (en) * 1976-03-15 1978-12-12 Mitsubishi Jukogyo Kabushiki Kaisha Vacuum forming or reduced-pressure moulding
EP0017902A1 (de) * 1979-04-21 1980-10-29 Klöckner-Humboldt-Deutz Aktiengesellschaft Verfahren zur Herstellung einer feuerfesten Giessereiform
US4287931A (en) * 1979-05-09 1981-09-08 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Vacuum-forming procedure in metal casting
US4488341A (en) * 1982-08-16 1984-12-18 Robertshaw Controls Company Method of making a fluid pressure actuator
US4818336A (en) * 1986-04-11 1989-04-04 Advanced Tool Technologies, Incorporated Method of making metal molds and dies
US4931242A (en) * 1988-02-19 1990-06-05 Sintokogio, Ltd. Method of forming shaped-body to be sintered
US4943398A (en) * 1985-03-15 1990-07-24 Toshiba Monofrax Co., Ltd. Method for manufacturing a fused cast refractory
US5439622A (en) * 1993-09-07 1995-08-08 Motorola, Inc. Method and apparatus for producing molded parts
US5686038A (en) * 1995-06-06 1997-11-11 The Boeing Company Resin transfer molding of composite materials that emit volatiles during processing
US5709893A (en) * 1995-06-06 1998-01-20 The Boeing Company Breathable tooling for forming parts from volatile-emitting composite materials
US20030139721A1 (en) * 2002-01-15 2003-07-24 Kimberly-Clark Worldwide, Inc. Absorbent article having discontinuous absorbent core
US20030171728A1 (en) * 2002-01-15 2003-09-11 Kimberly-Clark Worldwide, Inc. Absorbent article with reinforced absorbent structure
US6663811B2 (en) * 2000-05-10 2003-12-16 Daimlerchrysler, Ag Process for producing a mold
US20040061264A1 (en) * 2002-09-26 2004-04-01 Kimberly-Clark Worldwide, Inc. Process and apparatus for air forming an article having a plurality of reinforced superimposed fibrous layers
US20040102751A1 (en) * 2002-11-27 2004-05-27 Kimberly-Clark Worldwide, Inc. Absorbent article with reinforced absorbent structure
US20040098838A1 (en) * 2002-11-27 2004-05-27 Kimberly-Clark Worldwide, Inc. Controlled placement of a reinforcing web within a fibrous absorbent
US20040195720A1 (en) * 2001-09-13 2004-10-07 Fitzell James Richard Thermoforming method and apparatus
US20050013888A1 (en) * 2002-01-15 2005-01-20 Kimberly-Clark Worldwide, Inc. Apparatus for making a reinforced fibrous absorbent member
US20050015068A1 (en) * 2003-07-15 2005-01-20 Kimberly-Clark Worldwide, Inc. Absorbent article having a stretchable reinforcement member
US20050014428A1 (en) * 2003-07-15 2005-01-20 Kimberly-Clark Worldwide, Inc. Scrim reinforced absorbent article with reduced stiffness
US20130221192A1 (en) * 2012-02-29 2013-08-29 Ford Motor Company Interchangeable mold inserts

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5835041A (ja) * 1981-08-25 1983-03-01 Nippon Kokan Keishiyu Kk シエル鋳型の製造方法
GB2116889B (en) * 1982-03-23 1985-11-13 Acme Conveyors & Constr A process of moulding a metal casting mould
JPS59128888U (ja) * 1983-02-18 1984-08-30 立山アルミニウム工業株式会社 浴室用アルミサツシ
FR2612823B1 (fr) * 1987-03-27 1994-02-25 Essilor Internal Cie Gle Optique Outil a depression autoconformable a la surface d'une lentille ophtalmique et utilisable notamment comme tampon applicateur ou polissoir
FR2649916A1 (fr) * 1989-07-18 1991-01-25 Ferrer Erick Moule universel a surfaces de moulage adaptables pour le moulage de matieres plastiques, ceramiques ou autres materiaux
FR2908857B1 (fr) * 2006-11-21 2011-10-28 Novatec Procede et dispositif de mise en oeuvre d'un systeme de posage ou de moulage compose d'une enceinte etanche contenant des particules

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955266A (en) * 1973-05-02 1976-05-11 Sintokogio, Ltd. Vacuum sealed molding process for producing molds having a deep concave portion or a convex portion

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5126123B2 (ja) * 1972-09-19 1976-08-04

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955266A (en) * 1973-05-02 1976-05-11 Sintokogio, Ltd. Vacuum sealed molding process for producing molds having a deep concave portion or a convex portion

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129164A (en) * 1976-03-15 1978-12-12 Mitsubishi Jukogyo Kabushiki Kaisha Vacuum forming or reduced-pressure moulding
EP0017902A1 (de) * 1979-04-21 1980-10-29 Klöckner-Humboldt-Deutz Aktiengesellschaft Verfahren zur Herstellung einer feuerfesten Giessereiform
US4287931A (en) * 1979-05-09 1981-09-08 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Vacuum-forming procedure in metal casting
US4488341A (en) * 1982-08-16 1984-12-18 Robertshaw Controls Company Method of making a fluid pressure actuator
US4943398A (en) * 1985-03-15 1990-07-24 Toshiba Monofrax Co., Ltd. Method for manufacturing a fused cast refractory
US4818336A (en) * 1986-04-11 1989-04-04 Advanced Tool Technologies, Incorporated Method of making metal molds and dies
US4931242A (en) * 1988-02-19 1990-06-05 Sintokogio, Ltd. Method of forming shaped-body to be sintered
US5439622A (en) * 1993-09-07 1995-08-08 Motorola, Inc. Method and apparatus for producing molded parts
US5686038A (en) * 1995-06-06 1997-11-11 The Boeing Company Resin transfer molding of composite materials that emit volatiles during processing
US5709893A (en) * 1995-06-06 1998-01-20 The Boeing Company Breathable tooling for forming parts from volatile-emitting composite materials
US6861017B1 (en) * 1995-06-06 2005-03-01 The Boeing Company Method for forming composite parts from volatile-emitting materials using breathable tooling
US6663811B2 (en) * 2000-05-10 2003-12-16 Daimlerchrysler, Ag Process for producing a mold
US7225853B2 (en) * 2001-09-13 2007-06-05 Corvac Composites, Llc Thermoforming method and apparatus
US20040195720A1 (en) * 2001-09-13 2004-10-07 Fitzell James Richard Thermoforming method and apparatus
US20030139721A1 (en) * 2002-01-15 2003-07-24 Kimberly-Clark Worldwide, Inc. Absorbent article having discontinuous absorbent core
US20070248708A1 (en) * 2002-01-15 2007-10-25 Kimberly-Clark Worldwide, Inc. Apparatus for Making a Reinforced Fibrous Absorbent Member
US7568900B2 (en) 2002-01-15 2009-08-04 Kimberly-Clark Worldwide, Inc. Apparatus for making a reinforced fibrous absorbent member
US7745687B2 (en) 2002-01-15 2010-06-29 Kimberly-Clark Worldwide, Inc. Absorbent article with reinforced absorbent structure
US6802834B2 (en) 2002-01-15 2004-10-12 Kimberly-Clark Worldwide, Inc. Absorbent article having discontinuous absorbent core
US20050013888A1 (en) * 2002-01-15 2005-01-20 Kimberly-Clark Worldwide, Inc. Apparatus for making a reinforced fibrous absorbent member
US7204682B2 (en) 2002-01-15 2007-04-17 Kimberly-Clark Worldwide, Inc. Apparatus for making a reinforced fibrous absorbent member
US6989118B2 (en) 2002-01-15 2006-01-24 Kimberly-Clark Worldwide, Inc. Process for making a reinforced fibrous absorbent member
US20030171728A1 (en) * 2002-01-15 2003-09-11 Kimberly-Clark Worldwide, Inc. Absorbent article with reinforced absorbent structure
US6982052B2 (en) 2002-09-26 2006-01-03 Kimberly-Clark Worldwide, Inc. Process and apparatus for air forming an article having a plurality of superimposed fibrous layers
US7094373B2 (en) 2002-09-26 2006-08-22 Kimberly-Clark Worldwide, Inc. Process and apparatus for air forming an article having a plurality of reinforced superimposed fibrous layers
US20040061263A1 (en) * 2002-09-26 2004-04-01 Kimberly-Clark Worldwide, Inc. Process and apparatus for air forming an article having a plurality of superimposed fibrous layers
US20040061264A1 (en) * 2002-09-26 2004-04-01 Kimberly-Clark Worldwide, Inc. Process and apparatus for air forming an article having a plurality of reinforced superimposed fibrous layers
US6981297B2 (en) * 2002-11-27 2006-01-03 Kimberly-Clark Worldwide, Inc. Controlled placement of a reinforcing web within a fibrous absorbent
US20040098838A1 (en) * 2002-11-27 2004-05-27 Kimberly-Clark Worldwide, Inc. Controlled placement of a reinforcing web within a fibrous absorbent
US20040102751A1 (en) * 2002-11-27 2004-05-27 Kimberly-Clark Worldwide, Inc. Absorbent article with reinforced absorbent structure
US20050014428A1 (en) * 2003-07-15 2005-01-20 Kimberly-Clark Worldwide, Inc. Scrim reinforced absorbent article with reduced stiffness
US20050015068A1 (en) * 2003-07-15 2005-01-20 Kimberly-Clark Worldwide, Inc. Absorbent article having a stretchable reinforcement member
US7345004B2 (en) 2003-07-15 2008-03-18 Kimberly-Clark Worldwide, Inc. Scrim reinforced absorbent article with reduced stiffness
US7594906B2 (en) 2003-07-15 2009-09-29 Kimberly-Clark Worldwide, Inc. Absorbent article having a stretchable reinforcement member
US20130221192A1 (en) * 2012-02-29 2013-08-29 Ford Motor Company Interchangeable mold inserts

Also Published As

Publication number Publication date
ATA839675A (de) 1976-12-15
FR2291810A1 (fr) 1976-06-18
FI58730B (fi) 1980-12-31
CH592483A5 (ja) 1977-10-31
SE7511673L (sv) 1976-05-24
FI58730C (fi) 1981-04-10
JPS5160629A (en) 1976-05-26
AT338448B (de) 1977-08-25
DE2550149B2 (de) 1977-06-16
SE419605B (sv) 1981-08-17
JPS5631178B2 (ja) 1981-07-20
GB1522499A (en) 1978-08-23
FR2291810B1 (ja) 1978-05-12
DE2550149A1 (de) 1976-05-26
FI753216A (ja) 1976-05-23

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